Drag-saw



(No Model.)

A. P. BOSTON.

DRAG SAW.

Patented Nov. 3, 1885.

, jizvwzw' UNITED STATES PATENT OEETEE.

ARNET P. BOSTON, OF EUREKA, TEXAS.

DRAG-SAW.

SPECIFICATION forming part of Letters Patent No. 329,531, dated November3, 1885.

Application filed July 20, 1885.

T0 aZZ whom it may concern.-

Be it known that I, ARNET P. BOSTON, a citizen of the United States,residing at Eureka, in the county of Navarro and State of Texas,haveinvented certain new and useful Improvements in Drag-Saws; and I dodeclare the following to bea full, clear, and exact description of theinvention, such as will enable others skilled in the art to which itappertains to make and use the same, reference being had to theaccompanying drawings, and to the letters and figures of referencemarked thereon, which form a part of this specification.

My invention relates to improvements in drag-saws; and it consists incertain novel features of construction, combination, and arrangementhereinafter fully described, and specifically pointed out in the claim.

In the drawings, Figure 1 is aside elevation ofa drag-saw provided withmyimprovements, and Figs. 2 and 3are detailviews of the mechanism forfeeding the saw to the work. Fig. 4 is a detail end view ofthe drivingmechanism. Fig. 5 is an enlarged plan view of the"crosspiece connectingthe upper ends of the slotted guide-standards.

A is a standard bifurcated at its upper end, the bifurcation extendingabout two-thirds of the way down the standard. The standard is providedwith a suitable rest or base-piece, A, by which it is held upright uponthe ground. Beams B are secured to the standard A, on each side ofthesame,and secured by the braces O. The braces O are provided withhandles 0, by which the machine may be movedfrom place to place. Acrankshaft, D, is journaled in suitable bearings on the two arms of thebifurcated portion of the standard A, the crank being between the saidarms. One end of the crank shaft is provided with a pinion, E, whichmeshes with a drive gear-wheel, E, operated by a crank-handle, E asshown. A pitman is connected at one end to the crankshaft D, and isdriven by it in the operation of the device. The other end of the pitmauis connected to the saw G and the lower end of the pendulum, as shown.The saw works between the ends of the beams, which are held to the logby a pin in the usual manner. The

upper end of the pendulum H is pivoted within a notched head-block, I,as clearly shownin Serial No. 172,130. (No model.)

Fig. 3. This block slides in the slotted standards J J, which aresecured in mortises inthe beams B. The head-block I is provided with arack-bar, I,whicl1 is extended upward from the said block and forms partof the same. A pawl, 1 engages the rack-bar I and prevents the backwardmovement of the same. The standards J J are connected at their upperends by a crosspiece, J, which is provided with an opening, J throughwhich the rackbar I projects. A pulley, J is supported in thecross-piece, which is provided with asuitable opening for the properworking of the same. A cord, K, attached to the head-block I, passesover the pulley J and back toashifting spool, L, supported between theupper ends of the bifurcated standard A. Thespool L is rigidly securedto a shaft, L, which is provided at one end with a knob, L as shown. Theshaft L is loosely supported in suitable openings formed in the arms ofthe standard A, and is shifted through the same during the operation ofthedevice. Thespool L is provided with a projection on one end, whichengages pins on the standard to prevent the rotation of the spool;Between the opposite end of the spool and the arm of the standard Iplace a coiled spring around the shaft L, which serves to keep the spoolin engagement with the pins on the standard.

In operation motion is given the saw by turning the drive-wheel E, andthe motion thus created will be transmitted to the saw through thepinion E, crank-shaft D, and pitman F,the crankshaft and pitman changingthe circular motion to reciprocating. The pendulum H will be caused tooscillate, and will serve to give a smooth regular motion to the saw. Asthe out in the log is deepened, the spool L can be turned, letting outthe cord Kandallowing the head-block I to fall, and the saw will be thuskept to the work. The rack-bar and pawl prevent the tension of the corddrawing the head-block backward.

To operate the spool, the knob L is pushed inward, releasing theprojection on the spool from engagement with the pin on the standard,and then rotated. By releasing the hold on the knob the coil-spring onthe shaft L will push the spool toward the opposite arm of the standardand re-engage the pins and projection.

Having thus described my invention, What I claim, and desire to secureby Letters Patent, 1s-

Theherein-described drag-saw, consisting of a standard, two beamsconnected to the stand ard on opposite sides thereof, a crank-shaft heldby the standard, suitable drive'gearing for operating the same, a pitmanconnecting the crank-shaft and the saw, a pendulum attached to the sawand the pitman at one end and to a sliding head-block at the other end,the head-block sliding in the slotted standards and having a rack-barextended therefrom, a pawl engaging the rack, the operating-cordattached to the headblock and passing over a spool to engage a pin onthe standard, and a spring coiled around the-shaft and bearing upon theopposite end of the spool and an arm of the standard, as and for thepurposes set forth.

In testimony whereof I aifiX my signature 1n presence of two witnesses.

ARNET P. BOSTON.

- WVitnesses:

E. A. JoHNsoN, H. D. JoHNsoN.

